12. If the lines \( \frac{x}{1}=\frac{y}{2}=\frac{z}{3}, \frac{x-1}{3}=\frac{y-2}{-1}=\frac{z-3}{4} \) and \( \frac{x+k}{3}=\frac{y-1}{2}=\frac{z-2}{h} \) are concurrent then
(A) \( h=-2, k=-6 \)
(B) \( h=\frac{1}{2}, k=2 \)
(C) \( h=6, k=2 \)
(D) \( h=2, k=\frac{1}{2} \)